Method for testing the rate of impact damage in repair areas of a spillway structure

Abstract

The application discloses a method for testing the impact damage rate of a repair area of a water discharge structure, and specifically comprises the following steps: repairing the repair area of the water discharge structure and installing a flow velocity measuring instrument, opening the sluice to discharge water, obtaining the average water flow impact speed under the water flow impact time t and the recess volume V2 of the repair area, establishing a relationship curve between the water flow impact time t and the recess volume V2, preparing a plurality of repair mortar-concrete test blocks, dividing the test blocks into two groups, using a falling ball impact test device to perform a falling ball impact test on one group of the repair mortar-concrete test blocks, measuring the compressive strength of the other group of the repair mortar-concrete test blocks, calculating the average value of the compressive strength of the other group, calculating the impact damage rate, and establishing a relationship curve between the impact damage rate and the recess volume V1; obtaining the impact damage rate and the water flow impact time t when the recess volume V1 is equal to the recess volume V2, and calculating the impact damage rate. t v f a a a b The impact damage rate obtained by the method is accurate and easy to operate.​​​​​​

Description

Technical Field

[0001] This invention belongs to the field of water conservancy engineering technology, specifically relating to a method for testing the impact damage rate of the repair area of ​​a spillway structure. Background Technology

[0002] In the field of hydraulic engineering, the safety and stability of spillway structures are of paramount importance. These structures are exposed to complex and ever-changing water flow environments for extended periods, and their surfaces and internal structures are susceptible to physical effects such as erosion and washout, leading to performance degradation and even structural damage. Therefore, timely and effective repair work is crucial for maintaining the normal operation of spillway structures.

[0003] In the repair process, performance evaluation of repair materials is a crucial step. Traditional performance evaluation methods mainly rely on simulated tests under laboratory conditions, testing key indicators such as impact damage rate of repair materials by simulating specific environmental conditions. However, these methods often fail to fully simulate the complex impact conditions in actual water flow environments, leading to discrepancies between test results and practical applications. Summary of the Invention

[0004] The purpose of this invention is to provide a method for testing the impact damage rate in the repair area of ​​a spillway structure, which solves the problem of low accuracy of existing methods.

[0005] The technical solution adopted in this invention is a method for testing the impact damage rate of the repair area of ​​a spillway structure, and the specific steps are as follows:

[0006] Step 1: Repair the area of ​​the spillway structure to be repaired and install a flow velocity meter. Open the gate to release water and obtain the water flow impact time. t Average water flow impact velocity v Based on the depression volume V2 of the area to be repaired, establish a curve relating the water flow impact time t to the depression volume V2.

[0007] Step 2: Prepare several repair mortar-concrete test blocks and divide them into two groups;

[0008] Step 3: Using a falling ball impact testing device, conduct falling ball impact tests on one group of repair mortar-concrete specimens, measure the compressive strength of another group of repair mortar-concrete specimens, and calculate the average compressive strength of the latter group. f Calculate the impact damage rate a And establish impact damage rate a The curve relating V1 to the volume of the depression;

[0009] Step 4: Obtain the impact damage rate when the indentation volume V1 equals the indentation volume V2. a Given the water flow impact time t, calculate the impact damage rate. b .

[0010] The invention is further characterized in that,

[0011] In step 1, the water flow impact time is obtained. t The process of determining the volume V2 of the depression in the area to be repaired is as follows: when the set water flow impact time t is reached, the gate is closed. After the water no longer impacts the area to be repaired, a 3D scanner is used to scan the area to be repaired to obtain a 3D model of the area to be repaired. The volume V2 of the depression in the area to be repaired is calculated based on the shape and size of the depression in the 3D model. After the scanning is completed, the gate is opened to release water in order to measure the volume V2 of the depression in the area to be repaired under different water flow impact times t.

[0012] The process of preparing a single repair mortar-concrete test block in step 1 is as follows: apply lubricating oil to the side wall and bottom plate of the mold, then pour concrete slurry into the mold until it is half full, and then stop. Cover the top of the concrete slurry with a middle plate. After the concrete slurry has initially set, remove the middle plate. After roughening the top of the concrete, pour mortar on the top of the concrete until the mold is full. After pouring, place the whole block in a standard curing room for curing until the desired curing age, and then demold it. After demolding, place the test block in a standard curing room for curing again to obtain the repair mortar-concrete test block.

[0013] Each repair mortar-concrete test block has a volume of 100mm×100mm×100mm, with the mortar portion having a volume of 100mm×100mm×50mm and the concrete portion having a volume of 100mm×100mm×50mm.

[0014] The mold includes a square base plate, and side plates are connected to all four sides of the square base plate. Adjacent side plates are connected to each other.

[0015] In step 3, the falling ball impact test device includes a base, on which a specimen holder is installed. One end of the base is connected to a telescopic bracket, the top of which is connected to one end of an L-shaped crossbeam. The other end of the L-shaped crossbeam is inserted into a spool, on which a rope is wound. One end of the rope is connected to the spool, and the other end is connected to a steel ball. The steel ball is positioned corresponding to the specimen holder. A hand crank is installed on the side wall of the spool away from the L-shaped crossbeam. An L-shaped safety lock is rotatably connected to the L-shaped crossbeam via a pin. A stop is installed on the end of the pin away from the L-shaped crossbeam. Several small crossbeams are installed on the side wall of the spool close to the L-shaped crossbeam and along its circumference. The safety lock cooperates with the small crossbeams.

[0016] The specific process of step 3 is as follows:

[0017] Step 3.1: Conduct a drop ball impact test on one set of repair mortar-concrete test blocks;

[0018] The specific process is as follows: Place the repair mortar-concrete test block into the test specimen holder, rotate the hand crank to rotate the spool and wind the rope onto the spool to adjust the falling height of the steel ball. The falling height is adjusted so that the speed at which the steel ball reaches the surface of the repair mortar-concrete test block is equal to the average water flow impact speed obtained in step 1. v When the values ​​are equal, stop turning the hand crank and engage the safety lock with the small crossbeam to fix the position of the spool. When the formal test is about to begin, open the safety lock, and the steel ball will drive the spool to rotate and release the rope. The steel ball will then fall onto the upper surface of the repair mortar-concrete test block and impact the test block. After the impact, the sand-filling method will be used to measure the depression volume V1 on the surface of the repair mortar-concrete test block 4.

[0019] Step 3.2, repeat step 3.1, and impact the surface of the repair mortar-concrete test block 4 multiple times until the surface depression volume V1 reaches the preset value and then stop impacting.

[0020] Step 3.3: After the impact test, the compressive strength of the repair mortar-concrete specimens after the impact is measured by a compressive strength test. f 0;

[0021] Step 3.4: Measure the compressive strength of another group of repair mortar-concrete test blocks using a compressive strength test and calculate the average compressive strength of this group. f ;

[0022] Step 3.5 Based on the compressive strength obtained in Step 3.3 f The average compressive strength obtained from step 0 and step 3.4 f Calculate the impact damage rate a ;

[0023] Step 3.6, based on the impact damage rate obtained in Step 3.5 a And the dent volume V1, establish the impact damage rate a The curve relating V1 to the volume of the depression.

[0024] In step 3.5, the impact damage rate a The expression is:

[0025] .

[0026] In step 4, the impact damage rate b The expression is:

[0027] .

[0028] The beneficial effects of this invention are:

[0029] (1) The method for testing the impact damage rate of the repair area of ​​the drainage structure of the present invention uses a falling ball impact test device to test the indentation volume of the test block and establish the impact damage rate. a The relationship curve between the volume of the depression and V1 is easy to operate and can be quickly tested in the laboratory, which greatly improves the test results.

[0030] (2) The method for testing the impact damage rate of the repair area of ​​the spillway structure of the present invention, through the impact damage rate a The impact damage rate can be obtained by using the relationship curves between the volume of the indentation V1 and the water flow impact time t and the volume of the indentation V2. This method can provide intuitive test results with high accuracy and operability, and can also quickly obtain the impact damage rate. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the repair mortar-concrete specimen in the method of the present invention;

[0032] Figure 2 This is a schematic diagram of the mold structure in the method of the present invention;

[0033] Figure 3 This is a schematic diagram of the falling ball impact test device in the method of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the spool in the method of the present invention;

[0035] Figure 5 This is the curve showing the relationship between the water flow impact time t and the depression volume V2 in Embodiment 6 of the present invention;

[0036] Figure 6 Impact damage rate in Embodiment 6 of the present invention a The curve relating V1 to the volume of the depression.

[0037] In the diagram, 1. Mortar section, 2. Concrete section, 3. Specimen holder, 4. Repair mortar-concrete specimen block, 5. Telescopic bracket, 6. Steel ball, 7. Hand crank, 8. Safety lock, 9. Base plate, 10. Side plate, 11. Middle plate, 12. Rope, 13. Base, 14. L-shaped crossbeam, 15. Spool, 16. Pin, 17. Stop block, 18. Small crossbeam. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] The method for testing the impact damage rate of the repair area of ​​a spillway structure according to the present invention comprises the following steps:

[0041] Step 1: Repair the area of ​​the spillway structure to be repaired and install a flow velocity meter. Open the gate to release water, and the flow velocity meter will collect the water flow impact velocity and obtain the water flow impact time in real time. t Average water flow impact velocity v Based on the depression volume V2 of the area to be repaired, establish a curve relating the water flow impact time t to the depression volume V2.

[0042] Step 2: Prepare several repair mortar-concrete test blocks 4, and divide them into two groups;

[0043] Step 3: Using a falling ball impact testing device, conduct falling ball impact tests on one set of repair mortar-concrete specimens 4, measure the compressive strength of another set of repair mortar-concrete specimens 4, and calculate the average compressive strength of this set. f Calculate the impact damage rate a And establish impact damage rate a The curve relating V1 to the volume of the depression;

[0044] Step 4: Obtain the impact damage rate when the indentation volume V1 equals the indentation volume V2. a Given the water flow impact time t, calculate the impact damage rate. b ;

[0045] Impact damage rate b The expression is: .

[0046] Example 2

[0047] Based on Example 1, in step 1, the water flow impact time is obtained. t The process of determining the volume V2 of the depression in the area to be repaired is as follows: when the set water flow impact time t is reached, the gate is closed. After the water no longer impacts the area to be repaired, a 3D scanner is used to scan the area to be repaired to obtain a 3D model of the area to be repaired. The volume V2 of the depression in the area to be repaired is calculated based on the shape and size of the depression in the 3D model. After the scanning is completed, the gate is opened to release water in order to measure the volume V2 of the depression in the area to be repaired under different water flow impact times t.

[0048] The 3D scanner used is the Trimble TX8, which performs excellently in terms of measurement speed, range, and accuracy, and can provide high-quality data results for dam depression measurement. Based on laser ranging and angle measurement, it generates the 3D coordinates of the target object through precise calculation, and finally forms a detailed 3D model.

[0049] Calculating the depression volume V2 using a three-dimensional model is an existing technique in this field.

[0050] Example 3

[0051] Based on Example 2, the process of preparing single-piece repair mortar-concrete test block 4 in step 2 is as follows: apply lubricating oil to the side wall and bottom plate of the mold, then pour concrete slurry into the mold until it is half full, and then stop. Cover the top of the concrete slurry with a middle plate 11. After the concrete slurry has initially set, remove the middle plate 11. After roughening the top of the concrete, pour mortar on the top of the concrete until the mold is full. After pouring, place the whole block in a standard curing room for curing until the desired curing age, and then demold. After demolding, place the test block in a standard curing room for curing again to obtain repair mortar-concrete test block 4.

[0052] The standard curing room temperature is 20±3℃, and the relative humidity is not less than 90%.

[0053] like Figure 1 As shown, the volume of each repair mortar-concrete test block 4 is 100mm×100mm×100mm. Each repair mortar-concrete test block 4 includes a concrete part 2 and a mortar part 1 from bottom to top. The volume of the mortar part 1 is 100mm×100mm×50mm, and the volume of the concrete part 2 is 100mm×100mm×50mm.

[0054] like Figure 2 As shown, the mold includes a square base plate 9, and side plates 10 are connected to all four sides of the square base plate 9. Adjacent side plates 10 are connected to each other.

[0055] Example 4

[0056] Based on Example 3, in step 3, as follows: Figure 3 and Figure 4 As shown, the falling ball impact test apparatus includes a base 13, on which a specimen holder 3 is mounted. One end of the base 13 is connected to a telescopic bracket 5, the top of which is connected to one end of an L-shaped crossbeam 14. The other end of the L-shaped crossbeam 14 is inserted into a spool 15, on which a rope 12 is wound. One end of the rope 12 is connected to the spool 15, and the other end is connected to a steel ball 6. The steel ball 6 corresponds to the specimen holder 3. The spool 15 is located at... A hand crank 7 is provided on the side wall of the L-shaped crossbeam 14. An L-shaped safety lock 8 is rotatably connected to the L-shaped crossbeam 14 via a pin 16 (i.e., the side wall of the L-shaped crossbeam 14 is connected to one end of the pin 16, and the L-shaped safety lock 8 is rotatably connected to the pin 16). A stop block 17 is provided at the end of the pin 16 away from the L-shaped crossbeam 14. Several small crossbeams 18 are provided on the spool 15 close to the side wall of the L-shaped crossbeam 14 and along its circumference. The safety lock 8 cooperates with the small crossbeams 18.

[0057] Example 5

[0058] Based on Example 4, the specific process of step 3 is as follows:

[0059] Step 3.1: Conduct a drop ball impact test on one set of repair mortar-concrete test blocks 4;

[0060] The specific process is as follows: Place the repair mortar-concrete test block 4 into the test specimen holder 3, rotate the hand crank 7 to rotate the spool 15 and wind the rope 12 onto the spool 15 to adjust the falling height of the steel ball 6. The falling height is adjusted so that the speed at which the steel ball 6 reaches the surface of the repair mortar-concrete test block 4 is equal to the average water flow impact speed obtained in step 1. v When the values ​​are equal, stop rotating the hand crank 7 and engage the safety lock 8 with the small crossbeam 18 to fix the position of the spool 15. When the formal test is about to begin, open the safety lock 8, and the steel ball 6 will drive the spool 15 to rotate and release the rope 12. The steel ball 6 will then fall onto the upper surface of the repair mortar-concrete test block 4 and impact the repair mortar-concrete test block 4. After the impact, the sand filling method will be used to measure the depression volume V1 on the surface of the repair mortar-concrete test block 4.

[0061] Step 3.2, repeat step 3.1, and impact the surface of the repair mortar-concrete test block 4 multiple times until the surface depression volume V1 reaches the preset value and then stop impacting.

[0062] Step 3.3: After the impact test, the compressive strength of the repair mortar-concrete specimen 4 after the impact is measured by a compressive strength test. f 0;

[0063] Step 3.4: Measure the compressive strength of another group of repair mortar-concrete test blocks 4 using a compressive strength test and calculate the average compressive strength of this group. f ;

[0064] Step 3.5 Based on the compressive strength obtained in Step 3.3 f The average compressive strength obtained from step 0 and step 3.4 f Calculate the impact damage rate a ;

[0065] ;

[0066] Step 3.5, based on the impact damage rate obtained in Step 3.5 a And the dent volume V1, establish the impact damage rate a The curve relating V1 to the volume of the depression.

[0067] Example 6

[0068] The method for testing the impact damage rate of the repair area of ​​a spillway structure according to the present invention comprises the following steps:

[0069] Step 1: Repair the area of ​​the spillway structure to be repaired and install a flow velocity meter. Open the gate to release water. The flow velocity meter collects the water flow impact velocity in real time and calculates the water flow impact time.t Average water flow impact velocity v In this embodiment, the average water flow impact velocity v The speed was 10 m / s, and the impact time of different water flows was measured. t The depression volume V2 of the area to be repaired is shown in Table 1. The following is a model: Figure 5 The curve showing the relationship between water flow impact time t and depression volume V2 is shown.

[0070] Measuring water flow impact time t The process of determining the volume V2 of the depression in the area to be repaired is as follows: When the set water flow impact time t is reached, the gate is closed. After the water flow impact time t is stopped, a 3D scanner is used to scan the area to be repaired to obtain a 3D model of the area to be repaired. The volume V2 of the depression in the area to be repaired is calculated based on the shape and size of the depression in the 3D model. After the scanning is completed, the gate is opened to release water in order to measure the volume V2 of the depression in the area to be repaired under different water flow impact times t. That is, the gate must be closed every time the volume V2 of the depression in the area to be repaired is measured.

[0071] Table 1

[0072]

[0073] Step 2: Prepare several repair mortar-concrete test blocks 4, and divide them into two groups;

[0074] The process of preparing single-piece repair mortar-concrete test block 4 is as follows: apply lubricating oil to the side wall and bottom plate of the mold, then pour concrete slurry into the mold until it is half full, and then stop. Cover the top of the concrete slurry with the middle plate 11. After the concrete slurry has initially set, remove the middle plate 11. After roughening the top of the concrete, pour mortar on the top of the concrete until the mold is full. After pouring, place the whole block in the standard curing room for curing until the desired curing age, and then demold. After demolding, place the test block in the standard curing room for curing to obtain repair mortar-concrete test block 4.

[0075] The standard curing room temperature is 20±3℃, and the relative humidity is not less than 90%.

[0076] Each repair mortar-concrete test block 4 has a volume of 100mm×100mm×100mm. Each repair mortar-concrete test block 4 includes a concrete part 2 and a mortar part 1 from bottom to top. The volume of the mortar part 1 is 100mm×100mm×50mm, and the volume of the concrete part 2 is 100mm×100mm×50mm.

[0077] In this embodiment, the mortar-concrete test block 4 is prepared with polyurethane repair mortar for the mortar part 1 and C30 concrete for the concrete part 2.

[0078] The polyurethane repair mortar is composed of a vegetable oil-modified polyether polyol aqueous dispersion, active isocyanate functional group substances, inorganic active aggregates and color pastes. The mass ratio of the vegetable oil-modified polyether polyol aqueous dispersion, active isocyanate functional group substances, inorganic active aggregates and color pastes is 0.71:1.09:9.5:0.5.

[0079] C30 concrete is composed of the following substances: 402 kg / m³ of cement. 3 1130 kg / m³ of crushed stone 3 664 kg / m³ of sand 3 205 kg / m³ of water 3 ;

[0080] Step 3: Using a falling ball impact testing device, conduct falling ball impact tests on one set of repair mortar-concrete specimens 4, measure the compressive strength of another set of repair mortar-concrete specimens 4, and calculate the average compressive strength of this set. f Calculate the impact damage rate a And establish impact damage rate a The curve relating V1 to the volume of the depression;

[0081] The specific process is as follows:

[0082] Step 3.1: Conduct a drop ball impact test on one set of repair mortar-concrete test blocks 4;

[0083] The specific process is as follows: Place the repair mortar-concrete test block 4 into the test specimen holder 3, rotate the hand crank 7 to rotate the spool 15 and wind the rope 12 onto the spool 15, adjust the falling height of the steel ball 6 to 5.1m, and at this falling height, the speed at which the steel ball 6 reaches the surface of the repair mortar-concrete test block 4 is compared with the average water flow impact speed obtained in step 1. v The speeds are equal, both being 10 m / s. At this point, stop rotating the hand crank 7 and engage the safety lock 8 with the small crossbeam 18 to fix the position of the spool 15. When the formal test is about to begin, open the safety lock 8, and the steel ball 6 will drive the spool 15 to rotate and release the rope 12. The steel ball 6 will then fall onto the upper surface of the repair mortar-concrete test block 4 and impact the surface of the repair mortar-concrete test block 4. After the impact, the volume of the depression V1 on the surface of the repair mortar-concrete test block 4 will be measured using the sand filling method.

[0084] Step 3.2, repeat step 3.1, and impact the surface of the repair mortar-concrete test block 4 multiple times until the surface depression volume V1 reaches the preset value and then stop impacting.

[0085] The preset value of the recess volume V1 in this embodiment is detailed in Table 2;

[0086] Step 3.3: After the impact test, the compressive strength of the repair mortar-concrete specimen 4 after the impact is measured by a compressive strength test. f 0;

[0087] In this embodiment, the number of the 4 sets of repair mortar-concrete test blocks used for the falling ball impact test is 7;

[0088] Step 3.4: Measure the compressive strength of another group of repair mortar-concrete test blocks 4 using a compressive strength test and calculate the average compressive strength of this group. f In this embodiment f =41 MPa;

[0089] In this embodiment, the number of the other set of repair mortar-concrete test blocks 4 is 1;

[0090] Step 3.5 Based on the compressive strength obtained in Step 3.3 f The average compressive strength obtained from step 0 and step 3.4 f Calculate the impact damage rate a ;

[0091] ;

[0092] The specific test data is shown in Table 2:

[0093] Table 2

[0094]

[0095] Step 3.6, based on the impact damage rate obtained in Step 3.5 a And the concave volume V1, establish as follows Figure 6 Impact damage rate shown a The curve relating V1 to the volume of the depression;

[0096] Step 4, based on the impact damage rate a Find the impact damage rate when the depression volume V1 equals the depression volume V2 by using the curves showing the relationship between the two values ​​and the curves showing the relationship between the water flow impact time t and the depression volume V2. a Calculate the impact damage rate based on the corresponding water flow impact time t. b , ;

[0097] The impact damage rate a of the repair area was measured to be 0.461 when the water flow impact time t of the spillway structure was 148 days. Therefore, the impact damage rate b is 0.461 / 148 = 0.0031.

Claims

1. A method for testing the impact damage rate of a repaired area of ​​a spillway structure, characterized in that, The specific steps are as follows: Step 1: Repair the area of ​​the spillway structure to be repaired and install a flow velocity meter. Open the gate to release water and obtain the water flow impact time. t Average water flow impact velocity v Based on the depression volume V2 of the area to be repaired, establish a curve relating the water flow impact time t to the depression volume V2. In step 1, the water flow impact time is obtained. t The process of determining the volume V2 of the depression in the area to be repaired is as follows: when the set water flow impact time t is reached, the gate is closed. After the water no longer impacts the area to be repaired, a 3D scanner is used to scan the area to be repaired to obtain a 3D model of the area to be repaired. The volume V2 of the depression in the area to be repaired is calculated based on the shape and size of the depression in the 3D model. After the scanning is completed, the gate is opened to release water in order to measure the volume V2 of the depression in the area to be repaired under different water flow impact times t. Step 2: Prepare several repair mortar-concrete test blocks (4) and divide them into two groups; Step 3: Using a falling ball impact tester, conduct a falling ball impact test on one group of repair mortar-concrete test blocks (4), measure the compressive strength of another group of repair mortar-concrete test blocks (4), and calculate the average compressive strength of the group. f Calculate the impact damage rate a And establish impact damage rate a The curve relating V1 to the volume of the depression; Step 3.1, a drop ball impact test was conducted on one group of repair mortar-concrete test blocks (4); after the impact, the indentation volume V1 on the surface of the repair mortar-concrete test block 4 was measured by the sand filling method; Step 3.2, repeat step 3.1, and impact the surface of the repair mortar-concrete test block 4 multiple times until the surface depression volume V1 reaches the preset value and then stop impacting. Step 3.3: After the impact, the compressive strength of the repair mortar-concrete test block (4) after the impact is measured by a compressive strength test. f 0; Step 3.4: Measure the compressive strength of another group of repair mortar-concrete test blocks (4) using a compressive strength test and calculate the average compressive strength of this group. f ; Step 3.5 Based on the compressive strength obtained in Step 3.3 f The average compressive strength obtained from step 0 and step 3.4 f Calculate the impact damage rate a ; Impact damage rate a The expression is: ； Step 3.6, based on the impact damage rate obtained in Step 3.5 a And the dent volume V1, establish the impact damage rate a The curve relating V1 to the volume of the depression; Step 4: Obtain the impact damage rate when the indentation volume V1 equals the indentation volume V2. a Given the water flow impact time t, calculate the impact damage rate. b .

2. The method for testing the impact damage rate of the repair area of ​​a spillway structure according to claim 1, characterized in that, The process of preparing a single repair mortar-concrete test block (4) in step 2 is as follows: apply lubricating oil to the side wall and bottom plate of the mold, pour concrete slurry into the mold until it is half full, cover the top of the concrete slurry with a middle plate (11), remove the middle plate (11) after the concrete slurry has initially set, roughen the top of the concrete, pour mortar on the top of the concrete until the mold is full, after pouring, place the whole block in a standard curing room for curing until the desired age, and then demold. The demolded test block is then placed in a standard curing room for curing to obtain the repair mortar-concrete test block (4).

3. The method for testing the impact damage rate of the repair area of ​​a spillway structure according to claim 2, characterized in that, The volume of each of the repair mortar-concrete test blocks (4) is 100mm×100mm×100mm, the volume of the mortar part is 100mm×100mm×50mm, and the volume of the concrete part is 100mm×100mm×50mm.

4. The method for testing the impact damage rate of the repair area of ​​a spillway structure according to claim 2, characterized in that, The mold includes a square base plate (9), and each of the four sides of the square base plate (9) is connected to a side plate (10), with adjacent side plates (10) connected to each other.

5. The method for testing the impact damage rate of the repair area of ​​a spillway structure according to claim 1, characterized in that, In step 3, the falling ball impact test device includes a base (13), on which a specimen holder (3) is provided. One end of the base (13) is connected to a telescopic bracket (5), the top of which is connected to one end of an L-shaped crossbeam (14). The other end of the L-shaped crossbeam (14) is inserted into a spool (15). A rope (12) is wound on the spool (15). One end of the rope (12) is connected to the spool (15), and the other end of the rope (12) is connected to a steel ball (6). The steel ball (6) is positioned corresponding to the specimen holder (3). A hand crank (7) is provided on the side wall of the spool (15) away from the L-shaped crossbeam (14). An L-shaped safety lock (8) is rotatably connected to the L-shaped crossbeam (14) via a pin (16). A stop block (17) is provided at the end of the pin (16) away from the L-shaped crossbeam (14). Several small crossbeams (18) are provided on the side wall of the spool (15) close to the L-shaped crossbeam (14) and along its circumference. The safety lock (8) cooperates with the small crossbeams (18).

6. The method for testing the impact damage rate of the repair area of ​​a spillway structure according to claim 5, characterized in that, The specific process of step 3.1 is as follows: Place the repair mortar-concrete test block (4) into the specimen holder (3), rotate the hand crank (7) to drive the spool (15) to rotate and wind the rope (12) onto the spool (15) to adjust the falling height of the steel ball (6). Adjust the falling height so that the speed at which the steel ball (6) reaches the surface of the repair mortar-concrete test block (4) is equal to the average water flow impact speed obtained in step 1. v When the values ​​are equal, stop rotating the hand crank (7), and engage the safety lock (8) with the small crossbeam (18) to fix the position of the spool (15). When the formal test is conducted, open the safety lock (8), and the steel ball (6) will drive the spool (15) to rotate and release the rope (12). The steel ball (6) will then fall onto the upper surface of the repair mortar-concrete test block (4) and impact the surface of the repair mortar-concrete test block (4). After the impact, the sand filling method will be used to measure the depression volume V1 on the surface of the repair mortar-concrete test block 4.

7. The method for testing the impact damage rate of the repair area of ​​a spillway structure according to claim 1, characterized in that, In step 4, the impact damage rate b The expression is: 。

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